Simple Ventilators for Emergency Use Based on Bag-Valve Pressing Systems: Lessons Learned and Future Steps. - Castro-Camus, Enrique; Ornik, Jan; Mach, Cornelius; Hernandez-Cardoso, Goretti; Savalia, Bhushan; Taiber, Jochen; Ruiz-Marquez, Armando; Kesper, Karl; Konde, Srumika; Sommer, Caroline; Wiener, Julian; Geisel, David; et al. (Applied Sciences (2076-3417), 2020)